When calling `add_option` it returns an `Option` object which can return the
primary name of the option via `get_opt_name`. This should be used primarily
in the cross compatible implementation so that the order of parameters does
not matter.

There are now a lot of moving parts in Flake8. It can't help to give new
developers a high-level overview of how they all fit together to make
Flake8. =)